Abstract
The mode converter first applied by Tamm and Weiss and generalized by Allen and co-workers can be used to transform any general astigmatic beam into a stigmatic beam with twist. For the special case of three dimensional Hermite—Gaussian beams the transformed beams are twisted Hermite—Gaussian beams with complex arguments. Only if a set of conditions is fulfilled are the transformed beams Laguerre—Gaussian beams. The influence of the input beam parameters on the output beam is discussed.
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